LONDON W1
SUMMARY
SPECIFICATION
—
OVERVIEW
2.75m floor to ceiling height and
3.95m slab-to-slab
Raised floor on all levels with a void
of a minimum 150mm
CAT A finish to all commercial floors
Tenancy split – floors two to six have
the facility to be divided into three
tenancy splits
Four-pipe fan coil unit air
conditioning systems serve all
floors, with exposed multi-service
chilled beam solution serving part
of floors seven and eight
DESIGN CRITERIA
General office floor environmental
conditions for fan coil unit systems
are; 22 ± 2°C db 45% ± 10%
relative humidity
On floors seven and eight the
office environmental conditions
for multi-service chilled beam are;
24 ± 2°C db 45% ± 10% relative
humidity
Occupancy density of one person
per 10sq/m. In addition, there are
facilities on levels two to six inclusive
to increase both the fresh air and
cooling, allowing up to a maximum
of one person to 7 sq/m over a 500
sq/m section of the floor
Blinds manually operated on floors
two to six and motorised on floors
seven and eight
Office cooling and power load
allowances:
LED lighting with Simmtronic
controls on all commercial floors
- Small power load allowance
25W/sq m +5W/sq m at riser
branch connection
- Lighting load allowance – 12W/sq m
Two 2,000 k/VA tenant back-up
generators providing 100% back-up
power to the commerical tenants
VERTICAL TRANSPORTATION
Six 21 person / 1,600kg
passenger lifts
One 32 person / 2,400kg
goods lift
FACILITIES
10 car parking spaces (includes
five blue badge spaces and two
electrical car charging points)
224 secure cycle spaces
13 tenant showers
LONDON W1
DESIGN CRITERIA
—
A) EXTERNAL TEMPERATURE
Winter
-4°Cdb 100% RH (fabric)
-4°Cdb 100% RH (ventilation)
Summer
30°Cdb 21°C wb (design)
35°Cdb 24°C wb (heat rejection)
B) INTERNAL TEMPERATURE
Internal offices (for purposes
of main plant sizing)
Non air-conditioned user areas
18°C (minimum)
Toilet areas
18°C (minimum) / 24°C (maximum)
No relative humidity control
Staircase
18°C (minimum)
Reception
18–24°Cdb (additional local
heating to desk to be provided)
No relative humidity control
Chilled-beam air-conditioning system
Part levels 7 and 8:
Temperature 24°Cdb +/-2°C
Humidity 45%RH+/-10°C
Fan coil unit system
General office floors
(levels 2-6 inclusive, part levels
7 and 8)
Temperature: 22°Cdb +/-2%
Humidity: 45%RH +/-10%
Toilet areas
8 ac/h (supply)
10 ac/h minimum (extract
F) INFILTRATION RATES
Above-ground floors 0.5 ac/h within
4.5m perimeter zone.
Staircases
18°C (minimum)
G) AIR TIGHTNESS
Cladding leakage: fixed lights – 1.5m3/
hr/ per sq m wall @ 600Pa differential
pressure air leakage standard achieved
is 5m3/hr/sq m at 50 pascals test
pressure differential.
Reception
Natural ventilation through entrance door
Corridors (to conditioned areas) 18°C minimum / 24°C maximum
Corridors (to unconditioned areas)
18°C
C) OCCUPANCY
Offices
One person per 10 sq m with the
facility to increase both the fresh
air and cooling allowances up to
a maximum of one person per 7 sq m
over 500 sq m per floor for levels two
to six inclusive.
D) VENTILATION RATES
1.8l/s per sq m fresh air (+10%
allowance at main plant and ductwork
distribution for meeting rooms).
Smoke ventilation is by 2.5% openable
windows providing natural cross
ventilation -3 tenancy split.
E) TEA STATIONS SERVICE
PROVISION ONLY
Landlord’s extract plant and risers
serving four facilities per floor for
levels 2 to 7 inclusive, and two
facilities for level 8. Each 20 sq m
@ 15 ac/hr.
H) OCCUPANCY PERIOD
Plant noise emissions designed to allow
24hr operation, seven days per week.
I) SPRINKLERS
Ordinary hazard group 3 (life safety
protection) to offices, car park,
plantrooms and retail units. Design
density of 5mm/minimum. Area of
occupation 216 sq m. Loading bay to
have high hazard Group 1 protection
served by OHG3 storage tank.
J) BREEAM
A BREEAM rating of Very Good has
been achieved as a minimum standard.
LONDON W1
INTERNAL HEAT GAINS
AND ELECTRICAL POWER
ALLOWANCE­
—
A) LOAD ALLOWANCES
Offices areas:
One person/10 sq m, ie occupancy
10W/sq m (sensible)
5W/sq m (latent)
Lighting
12W/sq m
quipment and power loads
E
25W/sq m
quipment cooling and power
E
additional allowances
At floor/branch: + 5W/sq m
n-floor secondary equipment
O
rooms (SER) 500W/sq m over
20 sq m per tenancy three per floor
ain equipment room (MER)
M
1,250W/sq m over 500sq m
B) ILLUMINATION LEVELS
Office areas
A minimum level of 400 lux average
maintained illuminance at the working
place based on reflection values
of 75/60/25, a maintenance factor
of 0.8 and uniformity of 0.7-0.8 to
allow tenants to comply with LG7
requirements.
Toilet and circulation areas 200 lux
(with highlighted areas over wash
hand basins).
Lift lobbies
150 lux: refer to equation lighting
specification.
C) EMERGENCY LIGHTING
Generally to BSEN 1838 (BS 5266,
Part 7 - 1999)
Defined escape route 1 lux (minimum)
Office and on-floor secondary
equipment loads are included in
the base building’s chiller plant with
capacity in the chilled water risers
and floor plate heat exchangers to
distribute the SER load to each
tenancy. Space is provided for critical
cooling plant to serve an MER room
with appropriate resilience of N+1
and the SER cooling loads.
Open areas
0.5 lux (minimum) 15 lux for plantrooms/
panels required for emergency
switching/operation.
D) SPARE POWER CAPACITY
Distribution panels/distribution boards
are provided with the facility to install
an additional 20% spare ways, ie breaker
MCB/MCCBs/ACBs.
E) FIRE DETECTION SYSTEM
L2 for all offices and general landlord’s
areas with P2 coverage as necessary
to ensure compliance with the BS.
Manual break glass units only for car
parking areas/loading bay where
sprinkler cover is provided.
LONDON W1
MECHANICAL
SERVICES
—
NATURAL GAS DISTRIBUTION
A new incoming gas service is provided
to serve the boiler plant, CHP unit and
steam humidifiers.
LOW-TEMPERATURE HOT
WATER HEATING
Low-temperature hot water is produced
by low-nox gas-fired shell and tube
boiler plant at level -2 serving fan
coil units, air-handling unit coils and
domestic hot water requirements.
Boiler flues extend to roof level,
terminating in accordance with
Clean Air Act requirements.
A flue gas condensing unit is provided
on each boiler to maximise operational
efficiency. Low-temperature hot water
is distributed to zone headers in the
core (three per floor), from which
the tenants’ variable flow secondary
pumped circuits are distributed LTHW
to the fan coil units. This arrangement
prevents interaction between landlord’s
and tenants’ circuits, maintaining the
balance of the landlord’s system.
CHILLED WATER
Chilled water is produced by a
combination of an absorption chiller to
meet the base cooling load (as part of
a trigeneration system) and electrical
compressor water cooled chillers to
meet the peak cooling loads, located
at B -2.
FAN COIL SYSTEM
Level 2-6 office space is air
conditioned by a four-pipe fan coil
system with waterside controls.
GENERAL SUPPLY AND
EXTRACT SYSTEMS
a) Office areas
The offices are mechanically ventilated
by a roof-mounted central station
air-handling plant.
The mechanical ventilation system
provides de-humidification in summer
and humidification in winter with steam
injection by the landlord’s gas-fired
humidifiers at roof level.
Conditioned air is distributed from
the roof plantroom via insulated
sheet-metal duct risers in the core.
Four capped branch connections
with motorised shut-off dampers are
provided in the core for extension by
the tenant.
Exhaust air should be drawn from the
offices by a combination of air-handling
light fittings and return air grilles to suit
tenants’ requirements.
The ceiling void acts as a return air
plenum with air drawn back to
bell-mouth connections in the west
and east cores. The office air-handling
plants are provided with runaround
coil heat-recovery systems.
The offices shall be provided with
natural smoke ventilation providing 2.5%
cross flow via the perimeter windows.
b) Reception areas
The reception area is comfort
cooled and heated by two dedicated
recirculatory air-handling units.
Ventilation is provided by natural
infiltration through the main entrance
doors. Local electric heaters are
provided at low level in the
reception desk. Underfloor water
heating shall be provided throughout the
entrance area. Overdoor electric heaters
shall be provided over the pass doors
c) Toilet areas
Toilets are mechanically ventilated,
cooled and heated by dedicated supply
and exhaust plants at roof level with
heat recovery facilities on the airhandling plant.
CONTROL SYSTEMS
The mechanical services central plant
and terminal units are controlled by
a fully automatic BMS system with
an integrated system of distributed
intelligent controllers networked
together with a central supervisor to
provide monitoring, control, energy
metering and maintenance facilities
from the management suite.
FIRE STRATEGY
The fire fighting lobbies are smoke
ventilated by natural smoke vent shafts
with automatic opening vents at each
floor level.
An AOV is provided at the head of the
staircases. Fire detection and condition
relaying to motor control centres (MCCs)
and starter panels are carried out by the
fire alarm system.
CONTROL SYSTEMS
The mechanical services central plant
and terminal units are controlled by
a fully automatic BMS system with
an integrated system of distributed
intelligent controllers.
LONDON W1
ELECTRICAL SERVICES
—
Electrical services installation, electrical
engineering services - central plant
services (shell & core)
SUPPLY AUTHORITY SUBSTATION
AND INCOMING SUPPLY
An 11kV (HV) incoming supply based
on a 4MVA maximum demand, at an
operating power factor of 0.95, is
provided by UKPN Energy from the
local HV ring network. This is provided
in the form of a unit-protected cable ring
and is terminated in a five-panel HV, ie
switchboard, that is sited in a dedicated
UKPN Energy HV Switchroom.
HIGH-VOLTAGE SYSTEM
The supply is extended to landlord’s
HV switchgear that is equipped to allow
the connection of two 3.2MVA, midel
oil cooled type landlord’s transformers.
The 4MVA capacity is further enhanced
by the provision of a CHP generator set
capable of providing 500kW electrical
capacity. The CHP is arranged to run
parallel with the transformers feeding
the absorption chillers and associated
plant that is fed from the CHP.
LOW-VOLTAGE DISTRIBUTION
The transformers serve Form 4 type
5 LV distribution switchgear. Power is
distributed around the building through
a network of low-voltage cables run via
plantrooms rooms and risers terminating
at switchboards, motor control centres,
distribution boards and plant.
Supply to tenant areas is provided from
the main switchboard via dedicated
bus-bar risers arranged to enable each
floor to be divided into three tenancies.
Each tenancy is provided with
the following:
a) L
ighting/fan coil unit power
distribution board, fed via
a motorised circuit breaker
tap-off unit.
b) O
ne motorised circuit breaker
tap-off unit for a future power
distribution board.
c) O
ne future spare tap-off
position for future tenants’
power requirements.
METERING
The electrical distributions incorporate
a microprocessor-based intelligent
monitoring, metering and billing system.
The metering systems incorporate
communication networks to permit
collation of data for energy billing and
power management to issue instruction
for closing/opening of motorised
MCCBs and contactors under standby
generation modes of operation.
The metering system includes UPS and
battery back-up so that it continues
to fully function and report on status
during a mains power failure for up to
30 minutes, including PC.head end, LV
panels and remote mounted/located
meters, ie tenants’ meters.
EARTHING AND BONDING
Earthing and bonding is provided
in accordance with BS 76714 (The
IEE Wiring Regulations) and UKPN
requirements, with dedicated earth
electrodes provided for the standby
generators. All the transformer and
generator earth bars are bonded
together.
A dedicated clean earth system, with
an isolated earth bar provided within
each riser, has been installed for
future tenants’ computer rooms and
telecomms equipment.
SUPPLY AUTHORITY SUBSTATION
AND INCOMING SUPPLY
An 11KV (HV) incoming supply based
on a 4MVA maximum demand, at an
operating power factor of 0.95, shall be
provided by the local HV Ring network.
STANDBY GENERATOR/STANDBY
ELECTRICAL SUPPLY
Generator provisions comprise
the following:
a) T
wo 2000kVA prime rating,
multi-tenancy generator sets.
b) O
ne 630kVA prime rating, landlord’s
emergency services generator set.
c) The emergency services generator
is sited within a dedicated and
suitable fire-protected generator
room and multi-tenancy generators
are sited within a common
generator room.
LONDON W1
ELECTRICAL SERVICES
—
FIRE DETECTION AND PUBLIC
ADDRESS/VOICE ALARM
INSTALLATION
The fire alarm system is a fully
distributed, networked, interactive
digital address fire detection and alarm
system interfaced with a voice alarm
evacuation system all in accordance with
BS 5839 and the Building Control offices
requirements.
SECURITY SYSTEMS – CCTV
Access control and intruder monitoring
are generally provided for all primary
landlord’s entrances to the building,
entrances to the management suite,
entrance to the office’s goods lift lobby
from the loading bay, the entrance to
the car lifts and to the car parking areas
and access to the showers, the bike
store and the lifts at level -2.
The following detection coverage has
been agreed with the Building
Control Officer:
Escape doors generally and access to
the plant at levels -1 and -2 are provided
with intruder monitoring only. CCTV
is provided to generally monitor the
perimeter of the building, loading bay,
main entrance area, goods lift and car
lift lobbies, car lifts, goods lifts, car
parking areas and lift lobby areas at
level -2.
a) L2 for all offices and general landlord’s areas with P2 coverage
as necessary to ensure compliance
with the BS.
b) L2 for plantroom areas
Manual break glass units only for
car parking areas/loading bay
where sprinkler cover is provided.
The PA/VA system is a networked,
fully monitored system complete with
amplifiers to provide zoned coverage
to meet BS and Building Control
requirements for specific phased
evacuation protocol. Each office floor
is served by a dedicated networked
local amplifiers module providing dual
(Circuit A and Circuit B) provision
to each prospective tenancy. Loud
speakers have been selected to suit, and
speakers to office areas are mounted
within ceiling voids in accordance with
specialist manufacturer’s requirements
to ensure adequate noise and speech
intelligibility levels.
The passenger lifts are provided with
cabling only to accommodate the future
provision of a CCTV camera in each
car. Containment only is provided to
accommodate the future installation
of an access control system and intruder
alarms to tenants’ areas.
LONDON W1
TELECOMMUNICATIONS
AND LIGHTING
—
TELECOMMUNICATIONS
INSTALLATION
Two building entrance facilities (BEFs)
have been provided with four ducts
each to the building boundary for
provision of telecommunications from
different providers and for geographic
diversity. One of these has already been
connected to Openreach’s network,
which allows PSTN (public switched
telephone network) connections from
any provider that utilises Openreach’s
network, eg, BT, Talk Talk, Sky, etc. This
allows for connection of ISDN, ADSL
and other services.
Cabling routes are provided from the
BEFs to the tenant risers and have been
provided in order that cabling from the
BEF to the tenants’ floor can be fitted.
It may be necessary for the tenants
to request a survey from the provider
in advance of service installation
and agree documentation with the
building manager.
The building manager will control
and organise all media cabling in
the building.
SATELLITE PROVISION
Four dishes have been installed as well
as a digital terrestrial aerial and a DAB
aerial. This allows reception from the
tenant riser of Astra II, Astra I, Hotbird
and Badr, which provides services from
Sky and continental European and
Arabic television services as well
as Freeview.
An optical GTU (gateway termination
unit) should be installed and to this
a multiswitch, there is spacial and
electrical provision in the risers for
this. This should be sought through
the landlord’s approved contractor.
There is a single position that has been
provisioned for the installation of a
VSAT dish for two-way communication.
AUDIOVISUAL AND
BUILDING ENTRY SYSTEM
An audiovisual entryphone system shall
be provided for the main entrance to
the office building, loading bay, car
lifts, management suite and the postal
delivery entrance
IP NETWORK
The building is provided with an
integrated protocol (IP) network, which
provides a highly resilient data highway
for the building’s intelligent systems,
including BMS, security, lifts, energy
metering and lighting control.
A BSI user interface provides a live
portal on the building systems.
LONDON W1
TELECOMMUNICATIONS
AND LIGHTING
—
LIGHTING
Lighting has been be designed to
BSEN 12464 – 1:2002 and the CIBSE
Interior Lighting Code LG7. Full
compliance with LG7 shall have to be
achieved by the tenants to suit their
fitting-out requirements. Office area
lighting comprises of linear T5 recessed
mounted fluorescent luminaries, and
compact fluorescent downlights,
provision of containment only to allow
the future installation of uplighting
by the tenants and a programmable
lighting switching system to facilitate
enhancements to Building Regulations
Part L by the tenants to suit their fittingout requirements. All luminaries are
provided with high-frequency dimmable
DALI control gear.
The lighting control system shall be
configured to allow for compliance
with the Building Regulations. It shall
ensure future introduction of telephone
handset control of each group of office
lighting on the basis of one person per
10 sq m as part of the Cat B fitting-out.
Lighting control shall further include
daylight linking to perimeter zones with
zonal manual control via wall switches
at office ingress/egress points together
with notional corridor switches.
The system shall also allow future
introduction of presence detection
and/or wall switches via local LCMs.
Toilets and core areas shall be provided
with decorative low-voltage, LED and
compact fluorescent luminaires.
Entrance hall areas and associated
external areas and public art provisions
shall be provided with specialist lighting.
Lighting within the security room shall
be provided with dimming. Emergency
lighting shall comprise non-maintained
luminaires throughout the landlord’s
and tenants’ areas, to British Standards
requirements.
Testing/monitoring of emergency
lighting in office and landlord’s areas
shall be via the lighting control system.
The lighting control system shall also
be used to facilitate switching of the
lighting within landlord’s areas where
time switch, time delay or presence
detection switching is required. DDA
requirements with regards to accessory
heights shall be fully complied with.
AUDIOVISUAL AND BUILDING
ENTRY SYSTEM
An audiovisual entryphone system
shall be provided for the main entrance
to the office building, the loading bay
entrance, the car lifts entrance, the
entrance to management suite and the
postal delivery entrance with sufficient
capacity and communication links to
a station in the security room and the
entrance area.
DISABLED REFUGE ALARM
COMMUNICATION SYSTEM
A digital addressable, fully monitored
disabled refuge system for emergency
services/building management use shall
be provided at designated disabled
refuge locations in two stairwells in the
west core together within the east core
stairwell and shall include signals from
accessible WCs call system equipment.
The complete system shall comply
with BS 5839 (part 9) and BS 5588 (Part
8) legislation and “assist compliance to
the Disability Discrimination Act (DDA)
for the safe and efficient emergency
evacuation within any structure”.
LONDON W1
PUBLIC HEALTH INSTALLATION
AND FIRE PROTECTION
—
Public health installation, public
health engineering services –
central plant services (shell and core)
MAINS COLD WATER
A new metered mains water service
supplies a dedicated office cold water
storage tank.
DOMESTIC COLD WATER SYSTEMS
A boosted potable cold water mains
supply is distributed through dedicated
landlord’s risers to provide water to
basins and cleaners’ sinks within the
toilet core. Valved and capped drinking
water connection is provided within each
core for future tenants’ needs, based
on up to two or three tenancies per
floor. A further cold grey water service
distribution system is used to serve the
toilets within the toilet cores. The water
is distributed via a cold water pump set
from the dedicated underground,
grey water filtration/storage plant.
DOMESTIC HOT WATER SYSTEMS
Hot water is provided by centralised,
quick recovery plate heat exchangers
with buffer vessels located in the plant
areas on level -2 and served by the
central boiler plant. The system pressure
is generated via the packaged potable
cold water pumps set. The hot water
is distributed through the dedicated
landlord’s risers using a two-pipe
circulation system, providing hot water
to each toilet core. Valved and capped
hot water connections is provided within
each core for future tenant needs based
on up to two or three tenancies per floor.
DOMESTIC FOUL WATER DRAINAGE
A fully vented two-pipe soil system has
been designed to remove the effluent
from the various black water sanitary
appliances throughout the office’s
demise. Generally a mechanically jointed
lightweight cast iron piping system is
used for the main soil and ventilating
stacks. However, where any pipework
passes through another demise or where
pipework passes through sensitive areas,
galvanised steel with pre-welded joints
are used. The black water drainage
system collects together at high level
basement -1 and discharges to a
Thames Water sewer.
GREY WATER COLLECTION
A fully vented two-pipe waste system
has been designed to receive the
discharge from the grey sanitary
appliances throughout the office’s
demise. The discharge, when treated,
is used to supply water to the toilets
within the toilet cores. The grey water
drainage system gravitates down
to the building basement -2 to the
underground filtration/storage plant.
Fire protection services central plant services (shell & core)
DRY RISER
Dry risers/falling mains are provided
to serve all floors apart from the
ground floor.
The dry riser inlets are located in the
North Row façade of the building and
landing valves are located in each fire
fighting lobby.
SPRINKLER PROTECTION SYSTEMS
A sprinkler fire protection system
designed to an ordinary hazard group
3 Life Safety is provided to protect the
offices, loading bay and retail areas,
in accordance with BS 5306, LPC
Technical Bulletins and the insurer’s
requirements.
LONDON W1
TRANSPORT FACILITIES
AND SERVICING
—
SERVICING
All servicing facilities are provided
off-street, in the dedicated servicing/
refuse area. This area provided allows
for goods vehicles up to 10m/12m (rigid
wheelbase) in length to access and exit
the service area in a forward gear.
The building will be serviced using a
servicing area located off North Row
to the south of the building.
Two large bays accommodate vehicles
up to 10m/12m (rigid wheelbase) in
length and there are also two smaller
bays of approximately 6m in length and
a bay with the compactor, which allow
for an extra small vehicle bay. Swept
path analysis has been carried out to
confirm that these loading bays can be
safely accessed. There is the provision
for a future installation of a turntable
if the traffic flow direction changes on
North Row.
The access/egress for the service area
is via the ground floor loading area,
accessed from North Row, via Park
Street. There is a managed approach
to deliveries in the loading bay to help
the coordination with deliveries to the
retail units.
PARKING
There are 10 (five blue badge) car
parking spaces within the basement -2
level along with 224 bicycle spaces and
showers with changing facilities. This is
accessed via the car lifts on North Row.
PUBLIC TRANSPORT
The transport study indicates the
building is in an area of very high
public transport provision.
TAXI/VIP DROP-OFF
A taxi/VIP drop-off area provides an
access route in front of Park House.
This access route gives drivers the
impression that they are entering a
pedestrianised area. Signage and
appropriate landscaping reinforces
the change in use from highway to
shared surface area. Access to the
drop-off area is via Park Street only.